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Looking at DLT drives, what do these terms mean ? LVD, HVD, SE
HVD means High Voltage Differential, for which there are no SCSI cards available on the Mac. LVD means Low Voltage Differential, and your SCSI card is unlikely to support it.
You should try to find an SE drive, which means Single Ended SCSI.
(Differential means that the device measures the difference between the voltages on two lines, rather than one line always being at ground and the other at full voltage.)